Title: Force relaxation and hysteresis in a frictionless superconducting magnetic bearing

Authors: Cristian Cristache; Efren Diez-Jimenez; Ignacio Valiente-Blanco; Marco A. Alvarez-Valenzuela; Juan Sanchez-Garcia-Casarrubios; Jose Luis Perez-Diaz

Addresses: Insituto Pedro Juan de Lastanosa, Universidad Carlos III de Madrid, Spain ' Departamento de Ingeniería Mecánica, Universidad Carlos III de Madrid, Spain ' Insituto Pedro Juan de Lastanosa, Universidad Carlos III de Madrid, Spain ' Departamento de Ingeniería Mecánica, Universidad Carlos III de Madrid, Spain ' MAG SOAR SL, Spain ' Departamento de Ingeniería Mecánica, Universidad Carlos III de Madrid, Spain

Abstract: In this work, the mechanical behaviour of a frictionless superconducting magnetic bearing (SMB) is presented. The bearing is a thrust bearing composed of a YBaCuO superconducting disk and a NdFeB ring permanent magnet. A clear hysteretic behaviour of the radial and axial forces was observed. Finally, a relaxation in the levitation force of about 12%-15% of the initial levitation force was estimated. Similar force relaxation was observed in the radial force.

Keywords: superconducting magnetic bearings; force relaxation; mechanical hysteresis; cryogenic applications; high speed bearings; frictionless SMB; thrust bearings; levitation force; radial force.

DOI: 10.1504/IJSURFSE.2014.065836

International Journal of Surface Science and Engineering, 2014 Vol.8 No.4, pp.318 - 326

Received: 10 Jan 2014
Accepted: 15 Apr 2014

Published online: 23 Nov 2014 *

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